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It caused exception or crash on manual save or autosave.

Wrapped up shared data by a mutex

I have improved a process of loading game data. Now the loading process
is incapsulated by cLoader class. It loads data in a background thread.
Interaction with cLoader is done through SDL events.

cLoader got its initial support for loading mods. Though, most of mod
support is still in AnyUnitSize branch. cLoader loads mods by
iteratively calling cLoader::loadFolder(const char* path) method.

MakeLog function is changed. Now it is cLoader::writeConsole method. And
it has additional argument `increment`. It can specify whether we need
to write to the same line, or to the next. It makes generating text for
loading screen much easier.

AnyUnitSize merge: refactoring and cleaning up

See merge request maxr/maxr!15

These are small scale fixes I've made in AnyUnitSize branch:

 - Removed global Quit method. Event manager exits its event loop more gracefully.
 - Moved utlities like pcx, unifonts, tinyxml to appropriate folder
 - Global `cUniFont font;` has ben moved to static field inside cUniFont.
 - removed `#include "gameversion.h"` from netmessage2.h. It caused massive rebuilds after every git change.
 - updated paths to tinyxml2.h. It will not collide with system-wide version.

- Remove dependency to user installed compiler
- Add tag to make sure the job gets executed on a valid runner (in preparation to future runners on other platforms)

Fix gcc 8.1 build

See merge request maxr/maxr!16

removed pointer Job* from cUnit, as this introduced circular references between game objects, which cannot be deserialized. The pointer wasn't needed anyways...

improved surveyor ai: it now plans the whole move for the turn at once. Also plans more efficient routes, so it will survey more field per turn.